The Manifesto

What is the importance of a manifesto? What do manifestoes contribute to the design community? In addition to defining principles, it is intended to evoke emotion. This emotion is meant to spark action. Manifestos innately are tactile, or more than just words, they find a form to provide a message to a community. Architects as well are striving to find a form that evokes an emotional response and provides a message to a community. Successful architecture exists within a specific place and time, are manifestoes intended to exist only within a specific space and time, or are they eternal?